سفارشات اضطراری در سیستم موجودی بررسی دوره ای با هزینه های سفارش ثابت و زمان سرعتی تصادفی برای سفارشات عادی

Pure policies issuing either emergency orders or normal orders are used for benchmarking and initialization purposes of two combined policies, OPT and SIMP, which allow at most one normal order with remaining lead time longer than the lead time for emergency orders. The combined policies are computed by applying Markov decision models and, for some model-exogenous control variables, neighborhood search. The numerical study shows a large potential for cost improvement from using normal orders and emergency orders in combination. The relative cost increase of the new SIMP compared with the previously studied OPT is often about 1%. Because SIMP is easier than OPT to administer and explain, it is more appropriate than OPT for practical applications.